Improvement in coating- metal articles with india rubber



iluted tant @sind @inline coNsrANTINE HINGHER, or NEW BRUNSWICK, New JERSEY.

LettcrsPcte'ut No. 106,585, dated August 23, 1870.'

IMPROVEMENT COATNG- METAL ARTICLES WITH INDIA. RUBBER.

The Schedule referred to in these Lettere Patent and making part of the same.

"same, reference being had tothe accompanying drawing forming part ot' this specification.

This invention relats to improvements in covering buckles and other ,metal articles with India'glibber, and consists in the employment of varnish. soap, or other Substances which will expand under the action 'of heat, between the surface ofthe metal article to be coated and the coating of rubber, for preventing the India-rubber coating from shrinking away from the walls of the mold while confined in it in the vulcaniz'ingprocess, which shrinkage is very 'damaging to the coating, which, not being contined upon the smooth surface of the mold, becomes rough, and reqnires'considerable finishing a'fterremoval, and is often wholly ruined. l

'Figure 1 is a plan viewof a buckle covered according to iny improved process;

Figure 2 is a section of the same; and

Figure 3 is a plan vof' a buckle covered by the process now in use. i

Similar letters of reference indicate corresponding parts.

A is'the metal part of the buckle. The line'B represents .a coating of varnish, soap, soft metal, or any other `substance with which the iron may-be coated, and which will expand or vapori-ze under the action of .heat suciently to swell the covering G of Indiarubber ont snugly against the walls ofthe mold or flask into which the article to be coated is placed for vnlcanizing the covering of India rubber, and thereby securing it to the wire.

Buckles and other metalarticles have been-covered heretofore withrcoatings of Indiarubber, placed on them while in a tacky state, and secured by Vulcania'- ing in metal or. other molds; but, owing to the shrinkage of the lndia rubber in vulcanizing, caused by the' action of the heat, the coatings so applied are veryI apt to be ruined by the surface being irregular and rough, and.v by reason ot cavities formed in them by air orgases collecting in spots under tho skin, whichV are broken into inwsmoothingvand polishing the surfl i'ace, and, therefore, the manufacture ot'. such articles has not yet'been practically successful.

I have found that, by the use-of' substances between the skin of India rubber and the iron to be coated,

'which will swell under the action of heat, the said coverings maybe swelled out snugly against'the walls of the molds, and made very smooth and perfect on'- the exterior, so that, when removed from the molds, they require but little or no finishing. I have also found-that, after the vulcanizing and the articles have become cooled, the shrinkage of the said substance does not cause .any looseness of the India rubber. I therefore propose to make use 0f' this improved means in connection with the process now employed.

Having thus described my invention,

I claim as new and desire to secure by Letters Patent- The herein-described improvement in the process 'of covering metal articles with vulcanized India rubber, consisting in subjecting the articles, while undergoing a vnlcanizing process in the molds or flasks, to4 theaction ot' coatings of varnish, soap, or other sub-- stances, which will swell or expand by the action of the heat employed for vulcanizing the coverings of India rubben placed between the said metal articles andthe said India-rubber coverings, substantially as speciiied.

The above specification of my invention signed by me this 22d day of July, 1870.

CONSTANTINE HINGHER. W'tnesses:

L. S. MABEE, T. B. Mosnnn. 

